Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae941a71287bfc8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 03:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edff4ed5264ec0563041b1b9d2788f1d SHA-1: 01192a8a1171027f46a9e794cac93b56646710b7 SHA-256: 4ae941a71287bfc8a69b094d48ab4edbecbfb3cf4a1bf937f2cf21520849dc98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or scam campaign designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thingsantiquesla.com/userfiles/files/wuzelonikokedalat.pdf In PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090603041816.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425da79e363---44588054252.pdfIn PDF document text
    • http://reichspfarrer.sk/file/vazejepobesesosuvebuf.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/59088682641.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147619bc2290---86905072986.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/60629580936.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/fanazenunoxus.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fovosojurofupa.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/xafewikutujufuxeguwudi.pdfIn PDF document text
    • http://villkasz.hu/editor_up/73228109927.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/rubigafo.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/31526152291.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/5749389911.pdfIn PDF document text
    • https://fptica.ru/images/file/matale.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2523960c91f517de7c9defc7ca4ba938/maxusazejukudid.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/xufuvuvanebilutarib.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/16432162628.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55475522865.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/xixoluk.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/56374823193.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210912_24F0E1A5074A99EA.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613f888862aeb---33829988344.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901210523267853e0yrl22vs4di.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/femaminokidikaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=iphone+11+price+in+bdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 16824 bytes
SHA-256: 32cd02a5e25187cfedf7ee71b9e3cbbb1e062da43372f46d94c22c0fe06d9f8a
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 10280 bytes
SHA-256: f709d3fa1692273c8dc99ffbaa7c80a7d2722de73dddbe6274fdf3dcd2189964
font_02_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1